Sectional jack



(No Model.)

J. H. BAIRD.

SEGTIONAL JACK.

No. 396,321. Patented Jan. 15. 1889.

1 mmmm g miiit UNITED STATES PATENT OFFICE.

J OSEPII H. BAIRD, OF OAKVILLE, CONNECTICUT.

SECTIONAL JACK.

SPECIFICATION forming part of Letters Patent No. 396,321, dated January15, 1889.

I Application filed June 2, 1888. Serial No. 275,823. (No model.)

To all whom it may concern..-

Be it known that I, JOSEPH I'l. BAIRD, a citizen of the United States,residing at Oakville, in the county of Iiitchfield and State ofConnecticut, have invented certain new and useful Improvements inSectional Jacks; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains ,to make and use thesame. I

My invention has for its object to produce a jack adapted for generaluses, and especially valuable for use in connect-ion with planers andother metal-workin g machines, where it is frequently necessary tosupport heavy blocks of metal while being operated upon at variousangles.

In order to provide a handy tool for this and similar purposes, I havedew'sed the novel sectional jack, of which the following description, inconnection with the accompanying drawings, is a specification, numbersbeing used to denote the several parts.

Figure l is an elevation of the device complete and in operativeposition; Fig. 2, an elevation showing the parts detached, and Fig. 3 alongitudinal section corresponding with Fig. 1.

1 denotes the sections, which may be made of any convenient length, andany desired number may be used in a single jack. The sect-ions arepreferably provided with central openings, 3, in line with each other,with sockets 3 in their bases and with hubs t at their upper ends, thesockets and hubs all being of exactly the same size, so to make theparts interchangeable. \Vhen made of large size as, for instance, forjacking railway-cars and other heavy liftingeither of the sections 1 mayserve as the base of the jack. For planers and other machine-shop work Iprovide a special bottom section, 5, the sides of which are tapered, asshown. This is in order that the jack may be readily supported at.various angles and in various positions where it is not practicable togeta level support for the base.

6 denotes the top section, which is provided with an internalscrew-thread and with a heavy screw,-7, which engages the thread. Ifpreferred, I provide at the top of this section a cappiece, 8, having asocket, 9, and a setscrew, 10, the head of which rests in the socket andwhich passes through the cap-piece and engages screw 7, so that thecap-piece is held in position, but screw 7 is free to turn independentlythereof. In use the screw is turned to lift by means of a wrench appliedto squared portions 11 or 12, or by pins or levers inserted in holes 13.The operation is so simple as hardly to require explanation.

For general machine-shop purposes I ordinarily furnish jacks consistingof four sections in addition to the special top and bottom sections andthe screw. In use the jack is made approximately the length desired byplacing a sutlicient number of sections together. The base or bottomsection is placed firmly in position, and then the screw is rotated tolift the weight to the desired height. By this means I avoid the seriousinconvenience and other objections attending the common practice ofblocking up, and provide a simple tool complete in itself and adapted toall the various purposes for which this class of tools is intended."

Having thus described my invention, I claim As a new manufacture, alifting-jack comprising interchangeable sections of varying lengths,each section having a socket and hub, as shown, and a top sectionadapted to engage any section of the series and provided with alifting-screw of ordinary construction.

In testimony whereof I affix my signature in presence of two witnesses.

JOSEPH H. BAIRD.

Witnesses:

DANL. F. WEBSTER, CHAS. IV. VILLETTE.

